boiler

noun

boil·​er ˈbȯi-lər How to pronounce boiler (audio)
1
: one that boils
2
a
: a vessel used for boiling
b
: the part of a steam generator in which water is converted into steam and which consists usually of metal shells and tubes
c
: a tank in which water is heated or hot water is stored
d
chiefly British : furnace

Examples of boiler in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
An electric heat pump is three to five times as efficient as the gas boiler that sits in most American basements. Bill McKibben, New Yorker, 9 July 2025 This has accelerated the wear and tear on boilers, turbines, and pipes in Cuba’s power plants, shortening their life spans and causing frequent and costly outages. IEEE Spectrum, 1 July 2025 The schools also need necessary major maintenance upgrades like a new boiler, roof and plumbing. Caroline Beck, IndyStar, 27 May 2025 Evidence on the wreck indicates that the boilers were still running — and still being fed — up to the moment the ship split in two. Jordan Runtagh, People.com, 6 July 2025 See All Example Sentences for boiler

Word History

First Known Use

circa 1540, in the meaning defined at sense 1

Time Traveler
The first known use of boiler was circa 1540

Cite this Entry

“Boiler.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/boiler. Accessed 5 Aug. 2025.

Kids Definition

boiler

noun
boil·​er ˈbȯi-lər How to pronounce boiler (audio)
1
: a container in which something is boiled
2
: a strong metal container used in making steam
3
: a tank in which water is heated or hot water is stored

More from Merriam-Webster on boiler

Last Updated: - Updated example sentences
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